Rainbow Glass Skull Icon

High-resolution illustrations of the [Skull] icon created in a glossy, semi-transparent sculptural style. The icon should appear to be made of curved, flowing glass with reflective surfaces. Vivid refractive rainbow gradients are injected into the form, smoothly moving along its contours. The shape should be abstract yet recognizable, featuring a stylish, high-gloss finish and soft reflections that mimic the curve of light passing through transparent materials. Center the icon on a solid black background. No shadows, textures, or extra elements. Square aspect ratio.